RFR: 8347431: Update ObjectMonitor comments [v3]

[David Holmes]

On Tue, 14 Jan 2025 12:32:02 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

>> Please review this change that removes a couple of comments that are not true (verified with testing metadata at offset 8).  There are no functional changes.
>
> Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add TODO

Thanks for the tweaks.

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Marked as reviewed by dholmes (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/23042#pullrequestreview-2551440546